Case IH F-519849-31 - ECU – Engine Control Unit (ECU): Torque Limitation active

This is a secondary (consequential) fault code indicating the engine control system has intentionally reduced the engine's torque (power output/derate) to protect the engine or the emissions system from damage. It is a symptom of a primary root failure such as high engine coolant temperature, high exhaust gas temperature, turbocharger protection limits being exceeded, or a failure in the SCR/DEF aftertreatment system.

• MAGNUM AFS Connect
• Axial-Flow Combines (240 series, 7230, 8230)
• Steiger series tractors
• Magnum series tractors
• Puma series tractors

1. 1

   Read all fault codes using the CNH Electronic Service Tool (EST) or compatible scanner to find the primary active fault code logged at the same time.

2. 2

   Identify the root cause by looking for primary codes related to SCR/DEF system failures, overheating, or turbocharger protection.

3. 3

   Check live data by monitoring engine parameters (coolant temp, exhaust inlet/outlet temps, NOx PPM levels) with key ON (engine off) to identify erratic sensor data.

1. 1

   Address the Primary Fault

   Follow the OEM service manual troubleshooting steps for the primary fault code found during your diagnostic check.

2. 2

   Clear the Fault Memory

   Once the physical repair for the root cause is completed, use the diagnostic tool to clear the fault codes.

3. 3

   Reset Inducement Counters

   If the torque limitation was caused by an emissions/DEF system fault, you must perform an 'Inducement Counter Reset' via the engine diagnostic software.

4. 4

   Perform a Healing Cycle

   Run the engine under load (or put through a specific warm-up cycle where exhaust temps exceed 450°F) to verify the repair and command the ECU to lift the torque limitation.